Malicious PDF — malware analysis report

Static analysis result for SHA-256 965c53edb550db7e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 05:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2b3bff348b8ec795555098b019c12f3 SHA-1: 2de33964a8fa60b60dd90bfad6797910b2270e94 SHA-256: 965c53edb550db7e0089a79744661b3ae5389e242ace920b05939e3364894616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=how+to+send+in+bluetooth PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8b55004aa14fc278e3d95cb7cce34124/tawizenavibewovotomodop.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/vefuv.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/fipazizigowejojonibezudas.pdfIn PDF document text
    • https://heyratacademy.ir/file/kumos.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/17116183753.pdfIn PDF document text
    • http://eva.am/files/eb093c8660ac035e.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/goximos.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/jogujige.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/gikobev.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wituvokupusozuzedop.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/2992529579.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/30388329869.pdfIn PDF document text
    • https://airbays.com/userfiles/file/20010988260.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/ludixevexitokifefe.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3ea8a1b6---79528837931.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16324543311088933734.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/doniji.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/kafopifi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/85098120544.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/povovanuguxu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ltikgrv47qlh192kt68176i4r7/21143778272.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/69850492455.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/karuminokepalu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 10400 bytes
SHA-256: 43c6d5ebaeb34b72fc9fe4d5cda6f0165eebac9ad21d9382f9d59f071f0e391d
font_01_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 17352 bytes
SHA-256: e65a2a2f628c7f7a6004988d652cfa4572ca224f893bea94b5bc34739031f3bb
font_02_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1